Bevel gearboxes

A bevel gearbox enables alternatively stepping-down or stepping-up. The axles intersect in the gearbox in an angle of 90°. The edge length of the housing is reflected in the gearbox size (example: V 120 – housing edge length 120 mm).

Efficient power converters

Bevel gearboxes are highly precise and powerful torque converters. The high-performance gearboxes cope with today’s high requirements in every respect. They are compact and insensitive to shocks. It is not without reason that they are used worldwide in all industry sectors of machine and plant construction. In everyday language, bevel gearboxes are also known as bevel gears, bevel-gear axle drives, gear drives or step-down / step-up gears.

Toothing

ATEK bevel gearboxes have gear sets with high-quality spiral toothing made of hardened carburised steel.
A gear set comprises one bevel pinion (small number of teeth / small diameter) and one bevel gear (large number of teeth / large diameter).
Gear sets with spiral toothing offer the advantage of very favourable engagement factors (high meshing ratio).
Therefore they are predestined for usage with high loads, combined with optimal running smoothness and high transmission accuracy.

Construction types

Due to the modular system, different gearbox construction types can be configured.
The construction types differ in

Construction type

Number of gear sets

Additional gears

A0 to E0

1 gear set

F0 to K0

1 gear set

+ 1 bevel pinion or bevel gear

Branch-off gearbox

1 gear set

+ 2–3 bevel pinions / bevel gears

The construction types differ in type and number of the shafts, the rotational direction of the shafts and their support by bearings.

Example of order code: V 090 1:1 A0 – 1.1 -1000 /0000

Threaded mounting holes

All 6 sides of the gearboxes are machined and may be used as mounting surfaces.
All flanges always have threaded mounting holes.
You have the following available ordering Options:

Ordering options

Threaded mounting holes are located in the housing surfaces on the gearbox side

Threaded mounting holes are located in the flanges on the gearbox side

0

–

3, 5, 6

1, 2, 3, 4, 5, 6

1, 2, 4

3, 5, 6

9

1, 2, 4

3, 5, 6

The standard version has the order code 9.
Example of order code for mounting option 9: V 090 1:1 A0 – 9.1 -1000 /0000
Other mounting options must be enquired.

Installation position

The installation position is defined by the gearbox side directed downwards during operation and will be indicated by the associated numeral.

The gearboxes can be used in all installation positions.
The technically most favourable and thus recommended installation position is the position in which the shafts are horizontal.
These are the installation positions 1 and 2.
Please contact us for consultation if the angle of the gearbox side directed downwards deviates more than 15° from the horizontal position.
For an optimal technical design of the gearboxes, we principally ask to specify the installation position.
Example of order code for installation position 2: V 090 1:1 A0 – 1.2 -1000 /0000

Shaft designation – allocation to the gearbox sides

The fast-rotating shaft has the speed n1 and is identified by N1.

The bevel pinion is located on this shaft.
The slowly rotating shaft has the
speed n2 and is identified by N2.
The bevel gear is located on this shaft.

The gearbox sides are identified by the numerals 1 to 6 (see Figure 4.2.1-1; Gearbox sides)

Preferred direction of rotation

If the clockwise (CW) direction of rotation (viewing direction from shaft end face of the fast-rotating shaft towards the gearbox centre) is selected, a 1 to 2 dB(A) lower noise level is generated.

Efficiency

The achievable efficiency depends on rotational speed, torque, installation position, sealing, and lubricant type.
With gearboxes having only one gear set, an efficiency of 97% can be achieved.
With gearboxes having several gear meshings, an efficiency of 94% can be achieved. The efficiencies specified in the tables relate to the permissible nominal load and are guidance values for run-in gearboxes at operating temperature with standard sealing.

Lubrication

With the bevel gearboxes, different conditions for the lubrication will arise depending on gearbox size, rotational speed, on-period, temperature, and type of application.
The decisive variable is the circumferential speed of the bevel gear.
Depending thereon, different oil quantities and viscosities will be used.

These will be defined by ATEK based on your ordering details (rotational speed, on-period, and ambient temperature).

Abbreviation

Explanation

Reference

Letter

B

Oil viscosity 220

Table 6.2.8‑1

Numeral

0

No venting

Table 6.2.8‑2

For the abbreviations, refer to the following tables.

Oil viscosity table

Letter

Viscosity

A

460

B

220

C

68

D

Injection lubrication

E

Fluid grease

Depending on the gearbox size, injection lubrication may be necessary in case of high rotational speeds.
In case of very low rotational speeds, lubrication by fluid grease is also possible.

Numeral

Vent filter

0

No

1

Yes

Vent filter

If venting is required (B1 or C1) the gearboxes will be delivered with a vent filter.
The vent bores will be equipped with screw plugs for transport.
The vent filter will be enclosed as a separate item and must be mounted in the intended position prior to commissioning.
An elbow may be required.
Please adhere to the operating instructions!

The position of the filter will be specified in the order documents.
Please refer to the following table for the position of the filter.

Low-backlash construction

For optimal running, the tooth space in the gear set is manufactured larger than the tooth.
When the direction of rotation is changed, this results in a rotation angle until the counter-rotating tooth flanks contact each other.
This rotation angle is called circumferential backlash.

Circumferential backlash, measuring method

The circumferential backlash is measured after the shaft N1 has been fixed.
A force of around 2% of the nominal torque is applied to the shaft N2 in both rotational directions.
A tooth backlash will result between the two final positions. This can be measured as rotation angle and is indicated in minutes of arc [arcmin].

Circumferential backlash, type

All ATEK bevel gearboxes can be delivered as low-backlash types.
(u.r. = upon request)